package com.softWang.common.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;

/**
 * author: admin
 * date: 2020/5/27
 * description:
 */
@Component
public class IPUtils {
    private static final Logger log = LoggerFactory.getLogger(IPUtils.class);

    /**
     * 获取IP地址 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-
     * For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static  String getIpAddr(HttpServletRequest request) {
        String ip = null;
        try {
            //log.info("日志---->"+request);
            Enumeration<String> enumer = request.getHeaderNames();
            //while(enumer.hasMoreElements()){
                //log.info(enumer.nextElement());
            //}
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
                //log.info("x-forwarded-for---->"+ip);
            }
            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
                //log.info("WL-Proxy-Client-IP---->"+ip);
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
                //log.info("HTTP_CLIENT_IP---->"+ip);
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
                //log.info("HTTP_X_FORWARDED_FOR---->"+ip);
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("X-Real-IP");
                //log.info("X-Real-IP_FOR---->"+ip);
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
                //log.info("localhost---->"+ip);
            }
        } catch (Exception e) {
            log.error("IPUtils ERROR ", e);
        }

        // 使用代理，则获取第一个IP地址
        if (!StringUtils.isEmpty(ip) && ip.length() > 15) {
            //log.info("ip链----->"+ip);
            if (ip.indexOf(",") > 0) {
                ip = ip.substring(0, ip.indexOf(","));
            }
        }

        return ip;
    }

}
